Nanomaterials
·
2023
·Vol. 13
·期 15
·2259
·
IF 5.3
Haixia Wu,Zhenxu Lin,Jie Song,Yi Zhang,Yanqing Guo,Wenxing Zhang,Rui Huang
Zero-dimensional (0D) tin halide perovskites feature extraordinary properties, such as broadband emission, high photoluminescence quantum yield, and self-absorption-free characteristics. The innovation of synthesis approaches for high-quality 0D tin halide perovskites has facilitated the flourishing development of perovskite-based optoelectronic devices in recent years. However, discovering an effective strategy to further enhance their emission efficiency remains a considerable challenge. Herein, we report a unique strategy employing rapid heat treatment to attain efficient self-trapped exciton (STE) emission in Cs4SnBr6zero-dimensional perovskite. Compared to the pristine Cs4SnBr6, rapid thermal treatment (RTT) at 200 °C for a duration of 120 s results in an augmented STE emission with the photoluminescence (PL) quantum yield rising from an initial 50.1% to a substantial 64.7%. Temperature-dependent PL spectra analysis, Raman spectra, and PL decay traces reveal that the PL improvement is attributed to the appropriate electron–phonon coupling as well as the increased binding energies of STEs induced by the RTT. Our findings open up a new avenue for efficient luminescent 0D tin-halide perovskites toward the development of efficient optoelectronic devices based on 0D perovskites.Keywords:photoluminescence;self-trapped exciton;Cs4SnBr6;rapid thermal treatment
研究领域:
材料科学
·
光电学
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 23
·1901098
·
IF 7.125
Shunran Li,Qingsong Hu,Jiajun Luo,Tong Jin,Jing Liu,Jinghui Li,Zhifang Tan,Yibo Han,Zhi Zheng,Tianyou Zhai,Haisheng Song,Liang Gao,Guangda Niu,Jiang Tang
Low dimensional halide perovskites with self-trapped excitons (STEs) emission have emerged as promising white light phosphors because of their ultrabroadband emission covering the entire visible spectrum from 400 to 800 nm. Such a broad emission from a single material can overcome emission color change and self-absorption problems within multiple phosphors. However, the color rendering index (CRI) and correlated color temperature (CCT) as two essential parameters of white light quality can hardly be modulated in these perovskite materials. Here, rare earth ion Ho 3+ is introduced into Cs 2 (Na,Ag)InCl 6 for the first time, utilizing the hydrothermal method. Besides the strong warm white STEs emission, the as-synthesized materials exhibit effective characteristic emission of Ho 3+ in the visible region. Further, the mechanism of associated emission is explored and the existence of energy transfer from STEs to rare earth is first confirmed. A white light-emitting diode (LED) prototype is also fabricated by employing the Ho 3+ doped Cs 2 (Na,Ag)InCl 6 as the color conversion material on a commercial 365 nm GaN LED chip, achieving an improved CRI from 70.3 to 75.4 compared to the pure Cs 2 (Na,Ag)InCl 6 . This result suggests a promising way to achieve high quality single phase all-inorganic white phosphors and this mechanism has enormous potentials in other optoelectronic applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Hang Ruan,Zhongnan Guo,Jiawei Lin,Kunjie Liu,Lingling Guo,Xin Chen,Jing Zhao,Quanlin Liu,Wenxia Yuan
The Pb-free hybrid-layered-double perovskites (HLDPs) have been proposed as green and stable semiconducting materials for optoelectronic devices, but the synthesized members are still limited. Here, we report the synthesis of three new HLDPs, (C8H20N2)2AgMBr8 (M = In, Sb, and Bi), by a solution method using 1,4-bis(ammoniomethyl)cyclohexane (C8H20N22+) as the organic spacing cation. All three of these HLDPs show ⟨100⟩-oriented layered structures with Ag and In/Sb/Bi order arranged in corner-sharing octahedral layers. The first-principle calculations indicate the indirect-gap nature of (C8H20N2)2AgInBr8 and (C8H20N2)2AgSbBr8, while their Bi counterpart shows a direct band gap after considering spin–orbit coupling. The band gaps obtained by diffuse-reflectance spectroscopy are 3.11, 2.60, and 2.70 eV for M = In, Sb, and Bi, respectively. (C8H20N2)2AgInBr8 shows a broadband red emission centered at 690 nm, and it is mainly attributed to the self-trapped-excitons mechanism. Our results not only provide a series of new “Pb-free” HLDPs with chemical diversity but also help us to further understand the structure–property relationships of HLDP materials.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shujun Zhu,Jianguo Pan,Xinxin Chen,Hongbing Chen,Shangke Pan
Recently, zero-dimensional organic-inorganic lead halides perovskites have garnered considerable attention due to their exceptional photoelectric performance, however, the toxicity of lead makes their prolonged application difficult. In this work, centimeter-scale lead-free zero-dimensional perovskites [Emim] 4 [Cu 4 I 8 ] single crystals were grown by the solution evaporation method. The structure and composition of the crystals were analyzed using XRD , EDS , XPS , etc. The energy band structure and the partial density of states (PDOS) were calculated by using the density functional theory (DFT) based on the PBE hybrid functional. The excitation and emission spectra of the crystal material were determined under different conditions. The luminescence mechanism and fluorescence lifetime of the crystal were also analyzed, and the green emitting of the crystal was caused by self-trapped excitons (STEs). Interestingly, the compound showed excellent responsiveness to X-rays, which is rarely reported in organic-inorganic hybrid copper-based halides. Overall, [Emim] 4 [Cu 4 I 8 ] demonstrates its good potential.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Xian Wu,Guijie Liang,Song Wang,Yin Wang,Haisheng Song,Zha Li,Ruosheng Zeng,Qingsong Hu
Copper(I) halides (Cu(I)Hs) have attracted extensive attention for their excellent luminescent properties. However, their poor water stability seriously hinders their application. So far, research on the performance improvement has been rarely reported. In this paper, a cuprous halide composite (Cu(I)HC) containing CsCu2Cl2I, CsCu2ClI2, and CuI phases was synthesized and presented. Under 285 nm ultraviolet light irradiation, CsCu2ClI2 in Cu(I)HC showed an abnormal photoluminescence for CsCu2X3 (X = Cl, Br, I), which generates a blue sky emission with the wavelength of 475 nm and the full width at half maximum of 99 nm, showing a typical self-trapped exciton emission. The Cu(I)HC can also give near white and violet emission following the excitation wavelength from 250 to 360 nm. It is exciting that the water stability of Cu(I)HC underwent a qualitative leap when it was coated with polysiloxane. Near white light emission Cu(I)HC polysiloxane luminescent ceramics (PSOLCs) were prepared for WLED exploration. Our method not only enhanced the water resistance of solvent-sensitive Cu(I)Hs, but also endowed them with the property of flexibility, which greatly expands their application fields. The prepared PSOLCs have potential applications in optical information encryption, lighting, and flexible photoelectron.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Yinkun Liao,Yibo Hu,Yuanhao Zhou,Jingkun Chen,Xue Yang,Meng Gu,Kuan Ren,Jingtai Zhao,Qianli Li,He Feng
Copper halide scintillation materials with self-trapped exciton (STE) photoluminescence have attracted great interest in the field of optoelectronics. However, it is challenging for Cs3Cu2Br5 materials to achieve wider spectral emission and high spatial resolution X-ray imaging in applications. Herein, combining XRD and energy dispersive spectroscopy results, it is proved that Ag+ is doped into the Cs3Cu2Br5 lattice through an ion doping process, and PL is regulated from 460 nm to 543 nm. By density functional theory calculation, the band gap is reduced from 2.25 eV of Cs3Cu2Br5 to 1.99 eV of Cs3Cu2Br5:Ag, which is also consistent with the spectral redshift. The gradient study of the silver ion concentration from 5% to 35% shows that the best silver ion concentration is 25%. The experimental results show that the doped silver ions can improve the PL, PLE, PLQY, XEL and other properties of the material, such as the PLQY which increased from 27.38% to 90.62%. At the same time, Cs3Cu2Br5:Ag also has good stability, it can be stored in air for 30 days, and its PL intensity remains at 90.73%. The X-ray space of the Cs3Cu2Br5:Ag-UV scintillation film measured in a laboratory imaging system can reach 18.3 lp mm−1.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12342-12347
·
IF 2.7
Yu Qi,Chengyue Xin,Wenjun Zhang,Zhongfa Li,Zihan Chen,Zhongyu Duan
Te4+-doped Cs2ZrCl6 vacancy-ordered perovskites with excitation wavelength-dependent tunable color have been synthesised by a simple precipitation method at room temperature, with two luminescent centres originating from the Te4+ and the STE (self-trapping exciton) of the Cs2ZrCl6 itself, respectively. They exhibit two different emission characteristics at 254 nm and 365 nm excitation wavelengths. At an excitation wavelength of 254 nm, the emission characteristics allow Te4+-doped Cs2ZrCl6 to exhibit tunable emission from blue to white to yellow under the control of Te4+ doping. And the excitation wavelength of 365 nm shows yellow emission. Te4+ doped Cs2ZrCl6 phosphors were used for optical anti-counterfeiting, and the anti-counterfeiting patterns were well distinguished under 254 nm and 365 nm UV lamps, demonstrating the potential of this excitation wavelength-dependent tunable color material for optical anti-counterfeiting applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2024
·
IF 2.8
Xiumei Dong,Ruikun Pan
Recently Cu-doped all-inorganic zero-dimensional (0D) metal halides Cs 2 ZnX 4 (X = Cl, Br) have attracted many researchers due to their excellent fluorescence (FL) performance and low toxicity compared to lead-based perovskites . Although these 0D metal halides nanocrystals or small-sized single crystals are prepared via solution methods in most of the reports, we used the solid-state synthesis method to get Cu-doped Cs 2 ZnCl 4 powders and characterized their FL properties. The results and analysis indicate that Cu 2+ can be doped in Cs 2 ZnCl 4 up to 12 at.%, which enhances the FL of Cs 2 ZnCl 4 powder. The photoluminescence quantum yield (PLQY) at 480 nm rises from 1.11 % (undoped) to 20.06 % (6 at.% Cu doping). A modified triplet self-trapped excitons mechanism is presented to explain the enhanced Cu − doped Cs 2 ZnCl 4 powder.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 17
·4035-4043
·
IF 6.569
Ruxin Liu,Wenjun Zhang,Guojing Li,Wenjing Liu
Advanced anti-counterfeiting materials have great research significance in the fields of economy, safety and human health. Compared with independent color mixed anti-counterfeiting materials, ultraviolet (UV) excitation wavelength-dependent discoloration, which can realize the change of the emission peak shape and color under different excitation wavelengths, is more attractive. In this work, the Sb-doped Cs2ZrCl6 vacancy-ordered double perovskite was designed and synthesized for anti-counterfeiting materials. Due to the singlet and triplet transitions of Sb3+ ions and self-trapping exciton (STE) emission of the Cs2ZrCl6 host, the material showed emission variability from blue to orange-yellow color. In addition, room temperature synthesis and excellent air and humidity stability further enhanced the potential of Sb-doped Cs2ZrCl6 for application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-7
·
IF 14.919
Zhang Mingming,Zhao Lili,Xie Jiahao,Zhang Qian,Wang Xiaoyu,Yaqoob Najma,Yin Zhengmao,Kaghazchi Payam,Zhang San,Li Hua,Zhang Chunfeng,Wang Lei,Zhang Lijun,Xu Weigao,Xing Jun
Low-dimensional hybrid perovskites have demonstrated excellent performance as white-light emitters. The broadband white emission originates from self-trapped excitons (STEs). Since the mechanism of STEs formation in perovskites is still not clear, preparing new low-dimensional white perovskites relies mostly on screening lots of intercalated organic molecules rather than rational design. Here, we report an atom-substituting strategy to trigger STEs formation in layered perovskites. Halogen-substituted phenyl molecules are applied to synthesize perovskite crystals. The halogen-substituents will withdraw electrons from the branched chain (-R-NH 3 + ) of the phenyl molecule. This will result in positive charge accumulation on -R-NH 3 + , and thus stronger Coulomb force of bond (-R-NH 3 + )-(PbBr 4 2− ), which facilitates excitons self-trapping. Our designed white perovskites exhibit photoluminescence quantum yield of 32%, color-rendering index of near 90 and chromaticity coordinates close to standard white-light. Our joint experiment-theory study provides insights into the STEs formation in perovskites and will benefit tailoring white perovskites with boosting performance.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jiawei Lin,Niu Sun,Ruonan Yao,Kunjie Liu,Zhongnan Guo,Jing Zhao,Quanlin Liu,Wenxia Yuan
Low-dimensional organic–inorganic metal halides (OIMHs) have been explored as single-component white light emitters for applications in solid-state lighting. Herein, we report a zero-dimensional (0D) In-based OIMH (TMPDA)[InCl5(H2O)] (TMPDA = N,N,N′,N’-tetramethyl-1,4-phenylenediamine), which crystallizes in the noncentrosymmetric P212121 space group and contains hydrogen bonds between the adjacent [InCl5(H2O)]2– octahedra in structure. It exhibits a large optical band gap (4.10 eV) and dual-band emission under UV light. Spectroscopic analysis and theoretical calculation indicate that the high (404 nm)- and low (513 nm)-energy emissions are attributed to the bound excitons in organic ligands and self-trapped excitons in [InCl5(H2O)]2– units, respectively. It is found that Sb doping in this 0D hybrid provides additional orange (590 nm) emission assigned to the 3P1 → 1S0 triplet radiative recombination. By adjusting the doping level, the emission color can be turned from turquoise to orange, and interestingly, a single-component white-light emission is realized by balancing the high-energy emission from organic ligand, the turquoise emission from [InCl5(H2O)]2–, and the orange one from [SbCl5(H2O)]2–. This work not only provides a new OIMH showing the single-component white light emission but also demonstrates the potential of In-based hybrids with hydrogen bonds for solid-state luminescence.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Yanzhu Wang,Yanting Liu,Siqi Sheng,Qiumei Li,Lili Meng,Hua Yao,Qian Chen,Jieni Meng
The rare-earth based double perovskites (DPs) can effectively solve the poor controllability of lanthanide ions (Ln 3+ ) doping concentrations in traditional double perovskites. In this study, we reshape the UV excitability of Er 3+ by constructing an energy transfer (ET) channel from STE to Er 3+ in the rare-earth based Cs 2 NaGdCl 6 DPs, achieving efficient green emission with the photoluminescence quantum yield (PLQY) of 82.78 %. Excitingly, high-sensitivity temperature measurement within the temperature range of 303–430K is achieved based on the fluorescence intensity ratio (FIR). The maximum relative sensitivities S R (I 526 nm /I 552 nm ) and S R (I 526 nm /I 460 nm ) of Cs 2 NaGd 0.965 Cl 6 : 0.005Sb 3+ , 0.03Er 3+ reach 1.11 % K −1 and 0.90 % K −1 , respectively, indicating that Cs 2 NaGd 0.965 Cl 6 : 0.005Sb 3+ , 0.03Er 3+ is promising optical temperature sensing material. Furthermore, a white light-emitting diode (WLED) device was fabricated using Cs 2 NaGd 0.965 Cl 6 : 0.005Sb 3+ , 0.03Er 3+ and commercial red phosphor CaAlSiN 3 : Eu 2+ with a 365 nm chip, which exhibited a color rendering index (CRI) of 95.1, a correlated color temperature (CCT) of 4989 K, and CIE coordinates of (0.3443, 0.3397). This work broadens the application of rare-earth based Cs 2 NaGdCl 6 DPs.
研究领域:
材料科学
·
光学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）